Exposure to morning short-wavelength "blue" light may help sleep-deprived teens prepare for any stress or challenges that might come that day, more than dim light exposure. Fixed wake up times on school days, as well as not being able to fall asleep early, are causing many adolescents to become chronically sleep deprived. The CDC reports that nearly 70% of school kids are not getting the appropriate amount of sleep. Studies show that they are resting for less than 8 hours on week days.